package com.java.websocket.mapper;

import com.baomidou.mybatisplus.core.mapper.BaseMapper;
import com.java.websocket.model.User;
import org.apache.ibatis.annotations.Mapper;
import org.apache.ibatis.annotations.Select;


@Mapper
public interface UserMapper extends BaseMapper<User> {

    @Select("select count(*) from t_user")
    int selectAllCount();

}
